package com.itheima.包装类.myinteger;

public class Demo1 {
    public static void main(String[] args) {
        String s = "100";
        int num1 = Integer.parseInt(s);
        System.out.println(num1);

        String s2 = num1 + "";
        System.out.println(s2);


        Integer integer = Integer.valueOf(100);
        System.out.println(integer);

        String s1 = String.valueOf("100");
    }
}
